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Cai Lậy, situated in Tiền Giang province, Vietnam (10.4170° N, 106.0830° E), occupies a strategically important location within the Mekong Delta. The city’s geography is defined by its position at a crucial juncture – the intersection of major waterways and road networks facilitating trade and transportation throughout the region. The surrounding landscape is predominantly agricultural, characterized by expansive rice paddies, fruit orchards (particularly known for its pomelos), and aquaculture farms, forming a vibrant urban–rural gradient. Cai Lậy itself is relatively flat, typical of the Delta, with an elevation rarely exceeding 5 meters above sea level. This low elevation makes it susceptible to flooding during the monsoon season, a factor influencing urban planning and infrastructure development. The city lies close to the Mekong River and its intricate network of canals, providing both a source of livelihood and a potential pathway for pollutants. To the west, the landscape gradually transitions to more densely vegetated areas, while to the east, agricultural land extends towards the coastline. Industrial activity, though not as extensive as in larger Delta cities like Hồ Chí Minh City, is present, primarily focused on food processing and agricultural product packaging, contributing to localized air quality concerns. The Delta’s humid subtropical climate, coupled with the flat terrain, can lead to stagnant air conditions, particularly during periods of reduced wind, exacerbating the impact of emissions from both agricultural practices and limited industrial sources.

Cai Lậy’s air quality experiences a distinct seasonal pattern dictated by the region’s monsoon climate. The wet season, typically spanning from May to October, brings increased rainfall and humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, this period also sees increased agricultural burning, a traditional practice for land clearing and crop residue disposal, which can cause spikes in localized pollution, particularly in rural areas surrounding the city. The dry season, from November to April, is characterized by lower rainfall, higher temperatures, and reduced wind speeds. This combination often results in temperature inversions, where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing effectively. Fog, common during the cooler months of December and January, further compounds this issue, trapping pollutants close to the surface. Agricultural activities, including fertilizer application, also contribute to emissions during this period. Outdoor activity is generally more favorable during the wet season, especially after rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with fog or stagnant air. While the monsoon rains offer a degree of cleansing, the agricultural burning practices and temperature inversions pose significant challenges to maintaining consistently good air quality throughout the year. Careful management of agricultural practices and improved industrial emission controls are crucial for mitigating these seasonal variations.